46 



LEAVES. 



with a serrulated or slightly notched margin ; at h, may be seen the cleft stipules 

 or appendages of the leaf. 



/. Linear, as the grasses and Indian corn (Fig. 40, c) ; this leaf is sheathing, or in- 

 closes the stem by its base, as may be seen at d. Here the veins do not spread 

 out, but run from the base to tlie apex with a narrow strip of parencliyma. 



g. Deltoid, from the Greek letter delta, a ; the Lombardy poplar, e, affords an 

 example of the same. 



h. Sagittate (from sagitta, an arrow, 

 Fig. 41, a) ; the Sagittaria, an aquatic 

 plant, affords an example of this leaf. 

 The acute lobes are prolonged down- 

 ward. 



i. Acerose, or needle-shaped (Fig. 



41, b). Leaves of tliis kind are mostly 

 clustered together, as in the pine ; 

 they are subulate, rigid and evergreen. 

 Trees with acerose leaves are usually 

 natives of mountainous or northern 

 regions ; any other kind of leaves 

 would, in these situations, be over- 

 powered by the weight of snow, or 

 the violence of tempests ; but tliese 

 admit the snow and wind tbrough 

 their interstices. Their many points 

 and edges, presented even to a gentle 

 breeze, produce a deep solemn murmur in the forest 

 abroad and the tempest high, 



" The loud wind through the forest wakes, 

 With sound lii<e ocean's roaring, wild and deep, 

 And in yon gloomy pines strange music makes." 



Bums, in describing such a scene, says : " This is my best season for 

 my mind is wrapt up in a kind of enthusiasm to Him who ' walketh on 

 of the wind.' " 



_;'. Piyinatijid (Fig. 41, d) ; this 

 is a feather-veined leaf; when 

 finely divided like the teeth of a 

 comb, such leaves are said to be 

 pectinate. 



k. Lyrate (Fig. 41, c) differs 

 from piunatifad in havi^ig its ter- 

 minating segment broader and 

 more circular. 



I. Palmate, or hand-shaped (Fig, 



42, a) ; as in one species of the 

 passion-flower {Passifora cceru- 

 lea. The oblong segments like 



fingers arise from a space near the petiole, which may be considered as 

 to the palm of the hand. 



m. Pigitate, or fingered leaf /^~V^ y^ } Fig. 43. o, 



(Fig. 42, 6), differs from the palniate 

 in having no space resembling the 



palm of a hand ; but several dis- J i ^ y r^ c 



tinct leaflets arise immediately 

 from the petiole, as may be seen 

 in the horse-chestnut. 



n. Connate (Fig. 42, c), when 

 the bases of opposite leaves are so 

 united as to appear one entire leaf. 



o. Lobed is when leaves are 



c. Lanceolate — •/. Linear — g. Deltoid — h. Sagittate — i. Acerose.—;; Pinnatifid — k. Lyrate — I. Pal- 

 mate — m. Digitate— 71. Connate— -o. Lobed. 



and when the storm is 



devotion : 

 the wings 



analogous 



